<f>? Do you mean <t>? If you have that and your targeting something not heal able (like an enemy) you will default to yourself. If you have both <mo> and <t> in the same macroom and neither is being utilized (not targeting or hovering over a valid target) then you will again only heal yourself.

You cannot queue any macros. Queuing is where you press a skill will the current action is still in the process of completing and it will execute your next ability as soon as it can. It's a subtle effect that makes weaving alot smoother.